These are the most comfortable pajamas that I have ever owned. In fact, it's a problem, because I never want to wear anything else, either asleep or awake. The pants are so soft that changing into real pants for work feels like an odious task (plus, the pants have pockets!). The top actually works incredibly well on its own as a warm shirt, so I wear it in public quite often (and no one knows that it's supposedly a pajama top...). This has also helped me find fellow Critters in the wild (USPS, airport, coffee shop, etc.). Do note that to keep these pajamas so comfy, it's best to let them air-dry rather than putting them in the dryer. But I've now owned them for months and even with (very) frequent use, they are still just as soft as when I got them. In terms of sizing, the XS fits me (5'4", 130 lbs, wide hips) super well.